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I have a pair of Mosin M91s that have the most hard to clean bores I have ever run across.

I have tried Hoppes, Sweets and some other stuff that I can't recall right now. Put a boatload of patches, worn out a bore brush, took one to the range and shot some surplus through it and cleaned it again. Still look like there is loose particles of debris in the bore.

Any other suggestions? make me up some Ed's Red? Foaming bore cleaner?
Or just say screw it and make 'em wall hangers.

I've had good luck cleaning that sort of problem bore before using a penetrating oil like Knock-er-loose or good old Liquid Wrench. Being made to penetrate rusty bolt threads, it does a pretty good job of doing that to crud in a rifle bore. I'll plug the muzzle with a tapered dowel, lean the rifle muzzle down and fill with solvent and let sit over night. Repeat if needed and, like John Crusher said, use a 8mm or even a .45 caliber brush. Instead a patch tip on the cleaning rod, use a jag and push a tight patch though.

YMMV and, HTH

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I just need a million bucks! Is that so hard to understand?

2 dollar electric bore cleaner and 50/50 ammonia and water. Run for 5 minutes, clean bore electrode, run again until the gunk stops plating on the rod and the bubbly foam isnt grey with copper flecks. Do an internet search for the homemade electronic bore cleaner. It brought back an 1894 krag and a 1903A3 to good accuracy and cleaned out the grooves.

2 dollar electric bore cleaner and 50/50 ammonia and water. Run for 5 minutes, clean bore electrode, run again until the gunk stops plating on the rod and the bubbly foam isnt grey with copper flecks. Do an internet search for the homemade electronic bore cleaner. It brought back an 1894 krag and a 1903A3 to good accuracy and cleaned out the grooves.

Glad I saw this! I just picked up an old Enfield that has seen better days, so I'm hoping this will help the bore to be at least shootable. I'm not looking for a tack driver - unless this rifle was one in a former life - just something to plink with.

Alternate between specific copper(ammonia) and carbon removing bore cleaners. Hoppe's #9 will work a bit on both, but not nearly as well(especially when it comes to removing copper on something that fouled) as 2 separate cleaners. The layer effect of carbon over copper over carbon and repeat is why it seems like you almost have it licked until you run a brush down it or shoot it.

You also might try heating it(microwave a cup of water and pour it down the barrel) before using the ammonia based solvent. That usually seems to speed/increase the reaction some.

More importantly, how do they shoot? If ok, I seem to recall articles on some not shooting as well after all the crap has been removed.

Endless apologies to OP if you already knew this: The type of cleaning rod you use has a great effect on the ease and efficiency of bore cleaning, over and above the other cleaning equipment and cleaners you may use. A sturdy one-piece rod of sufficient length will give the best results. I use a .270 X 36" rod and with the rifle in a gun vise bore cleaning has never been a problem. YMMV. Best wishes. Dave

SharpShoot-R Brushless Wipeout foaming bore cleaner works great on very cruddy bores! Spray it into the bore, let it set overnight, then push the crud out with a patch. I repeat overnight as necessary till clean. Don't get the foam on the wood stock though as it will remove the finish.

Also have been using the liquid Brushless Wipeout. Soaking wet patch through the bore and let it sit for awhile. Great to clean a normal dirty bore and using a wet patch to wipe down other parts. I don't think it works as well as the foam for soaking overnight. However it doesn't harm the wood finish or so the instructions say.

Used Ed's Red for several years to soak parts. Works okay but takes more elbow grease.

All the other bore cleaners I have are unused and taking up shelf space since I started using the SharpShooter-Rs.

I've had good luck with Outers foaming bore cleaner. I fouled the crap outta my Remington '03 with a bunch of cast bullet reloads I bought from one of the 'old men' at my GC. Had to do four applications, letting it work overnight each time.
Larry

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"I aim to make mischief." Nathan Fillion in "Serenity".

I've got several MNs and the big issue is the carbon layers stuck between the copper layers. I cleaned a '29 Izhevsk Dragoon for 2 years and got god knows how many layers out of it and the accuracy got better and better. Good luck with yours and by all means be patient. It will clean up .

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Vigilance in Living Counteracts Stupidity in Dying.

Anyone never knock a long wood dowel slightly larger than the bore through?

...and other than likely becoming STUCK in the bore, what would knocking a piece of wood through the bore accomplish that could not be accomplished by one copper-coated "mandrel" at high heat and 50,000 PSI?

I cleaned 3 Argentine 1891 7.65 mausers
The bores were so fouled that you could just make out rifling.
I turned them muzzle down and squirted HOPPIES BENCHREST copper solv. down the bore,let set over night and the rag below turned green,scrub the bore with a stainless brush and repeat for 5 nights finally it was clean and looked like a sewer pipe as the crap filled the pits. Inaccurate as hell until It had enough ammo down the pipe to kinda fill the pits up and then they shot 6-8 in groups Before that 20 in groups.. BENCHREST will not hurt the bore ...

I have a French MAS 36 that I got from Century back in the day. The stock was in ugly shape, but the metal was all-matching with very clean grey-green parkerizing. The bore looked like a Calcutta sewer-pipe, though. I tried the Ed's Red because I thought it might be cosmoline, but no luck. I tried a couple of copper solvents, with a little bit of green coming out, but still a dark bore. I tried the aforementioned "$2.00 electric bore cleaner" and... HOLY CRAP! After a couple of hours, all kinds of little black flakes started floating out on the foam. On close examination, the flakes appeared to be lacquer. The French used brass-washed, and lacquer-coated steel-jacketed bullets in the past. After the electro-soak, I followed up with some lacquer-thinner and Hoppe's Benchrest. The bore was actually completely un-pitted and bright.

JMc

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"Buy all the beans, bullets, and band-aids you can afford boys. It's no longer a question of "IF", it's now only a question of "WHEN"."

there was a video on youtube a guy takes his mosins and puts the barrel in a pvc pipe with the bottom capped and fills the whole pvc pipe with mineral spirits comes back the next day and swears
the barrel cleans right up with no problem .

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fio para bellator
be the prepared warrior

Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”
¯ Mark Twain

"when you have integrity..... nothing else matters
when you don't have integrity.... nothing else matters"
Teach The Children This Simple Principle.... Bob Kelly

"Life is not a journey to the grave with the intention of arriving
safely in a pretty and well preserved body, but rather to skid in
broadside, thoroughly used up, totally worn out, and loudly
proclaiming -- WOW--What a Ride
l

This is what I do. Just shoot it , clean it ,shoot it, clean it... It'll get better each time. Once I get it clean after a few shootings and cleanings I then just wipe it out with a oiled patch followed by a dry patch after each time I shoot it.